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| 1 /* | 1 /* |
| 2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
| 6 */ | 6 */ |
| 7 | 7 |
| 8 #include "GrDitherEffect.h" | 8 #include "GrDitherEffect.h" |
| 9 #include "GrFragmentProcessor.h" | 9 #include "GrFragmentProcessor.h" |
| 10 #include "GrInvariantOutput.h" | 10 #include "GrInvariantOutput.h" |
| 11 #include "SkRect.h" | 11 #include "SkRect.h" |
| 12 #include "gl/GrGLFragmentProcessor.h" | 12 #include "gl/GrGLFragmentProcessor.h" |
| 13 #include "gl/builders/GrGLProgramBuilder.h" | 13 #include "gl/builders/GrGLProgramBuilder.h" |
| 14 | 14 |
| 15 ////////////////////////////////////////////////////////////////////////////// | 15 ////////////////////////////////////////////////////////////////////////////// |
| 16 | 16 |
| 17 class DitherEffect : public GrFragmentProcessor { | 17 class DitherEffect : public GrFragmentProcessor { |
| 18 public: | 18 public: |
| 19 static GrFragmentProcessor* Create() { | 19 static GrFragmentProcessor* Create() { |
| 20 GR_CREATE_STATIC_PROCESSOR(gDitherEffect, DitherEffect, ()) | 20 GR_CREATE_STATIC_PROCESSOR(gDitherEffect, DitherEffect, ()) |
| 21 return SkRef(gDitherEffect); | 21 return SkRef(gDitherEffect); |
| 22 } | 22 } |
| 23 | 23 |
| 24 virtual ~DitherEffect() {}; | 24 virtual ~DitherEffect() {}; |
| 25 | 25 |
| 26 const char* name() const override { return "Dither"; } | 26 const char* name() const override { return "Dither"; } |
| 27 | 27 |
| 28 void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const over
ride; | |
| 29 | |
| 30 GrGLFragmentProcessor* createGLInstance() const override; | 28 GrGLFragmentProcessor* createGLInstance() const override; |
| 31 | 29 |
| 32 private: | 30 private: |
| 33 DitherEffect() { | 31 DitherEffect() { |
| 34 this->initClassID<DitherEffect>(); | 32 this->initClassID<DitherEffect>(); |
| 35 this->setWillReadFragmentPosition(); | 33 this->setWillReadFragmentPosition(); |
| 36 } | 34 } |
| 37 | 35 |
| 36 void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const ov
erride; |
| 37 |
| 38 // All dither effects are equal | 38 // All dither effects are equal |
| 39 bool onIsEqual(const GrFragmentProcessor&) const override { return true; } | 39 bool onIsEqual(const GrFragmentProcessor&) const override { return true; } |
| 40 | 40 |
| 41 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; | 41 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
| 42 | 42 |
| 43 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; | 43 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
| 44 | 44 |
| 45 typedef GrFragmentProcessor INHERITED; | 45 typedef GrFragmentProcessor INHERITED; |
| 46 }; | 46 }; |
| 47 | 47 |
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| 85 // it up or let it remain constant during quantization. | 85 // it up or let it remain constant during quantization. |
| 86 fsBuilder->codeAppendf("\t\tfloat r = " | 86 fsBuilder->codeAppendf("\t\tfloat r = " |
| 87 "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.
5453);\n", | 87 "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.
5453);\n", |
| 88 fsBuilder->fragmentPosition()); | 88 fsBuilder->fragmentPosition()); |
| 89 fsBuilder->codeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n", | 89 fsBuilder->codeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n", |
| 90 args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_st
r()); | 90 args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_st
r()); |
| 91 } | 91 } |
| 92 | 92 |
| 93 ////////////////////////////////////////////////////////////////////////////// | 93 ////////////////////////////////////////////////////////////////////////////// |
| 94 | 94 |
| 95 void DitherEffect::getGLProcessorKey(const GrGLSLCaps& caps, | 95 void DitherEffect::onGetGLProcessorKey(const GrGLSLCaps& caps, |
| 96 GrProcessorKeyBuilder* b) const { | 96 GrProcessorKeyBuilder* b) const { |
| 97 GLDitherEffect::GenKey(*this, caps, b); | 97 GLDitherEffect::GenKey(*this, caps, b); |
| 98 } | 98 } |
| 99 | 99 |
| 100 GrGLFragmentProcessor* DitherEffect::createGLInstance() const { | 100 GrGLFragmentProcessor* DitherEffect::createGLInstance() const { |
| 101 return SkNEW_ARGS(GLDitherEffect, (*this)); | 101 return SkNEW_ARGS(GLDitherEffect, (*this)); |
| 102 } | 102 } |
| 103 | 103 |
| 104 GrFragmentProcessor* GrDitherEffect::Create() { return DitherEffect::Create(); } | 104 GrFragmentProcessor* GrDitherEffect::Create() { return DitherEffect::Create(); } |
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